Merge pull request #226 from intersystems/release-2.1.0

Update CHANGELOG.md for 2.1.0 release

Author: isc-tleavitt

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [2.1.0] - Unreleased
+## [2.1.0] - 2023-01-23
 
 ### Added
 - Support for Caché/Ensemble 2016.2.3, 2017.1.2, 2017.2.1, 2018.1.0 and later.